Beware of a silent man and still water

This page is about the saying "Beware of a silent man and still water".

Possible interpretation: A large expanse of water that is still and does not move is often deep and dangerous. We should be careful of it. In the same way, we should be careful with a person who does not talk much.

Note: beware (verb): be cautious; be careful | still (adj.): not moving

Quick Quiz:

The proverb "Beware of a silent man and still water" is really a warning about